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  • In an AP, if d = –4, n = 7, a_n = 4, then a is

In an AP, if d = –4, n = 7, an=4, then a is

(A) 6

(B) 7

(C) 20

(D) 28

Answers (1)

Given

\\a\textsubscript{n} = 4, d = - 4, n = 7 \\Use \ a\textsubscript{n} = a + (n - 1).d\\ a + (7 - 1). (- 4) = 4\\ a +(6).(-4) = 4\\ a - 24 = 4\\ a = 4 + 24\\ a = 28\\

 Hence option D is correct

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infoexpert21

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